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https://issues.apache.org/jira/browse/SCXML-187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885899#comment-13885899
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Woonsan Ko commented on SCXML-187:
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Nice feature!
> Add support for initial SCXML script (SCXML spec 3.2.2: <scxml> children)
> --------------------------------------------------------------------------
>
> Key: SCXML-187
> URL: https://issues.apache.org/jira/browse/SCXML-187
> Project: Commons SCXML
> Issue Type: New Feature
> Affects Versions: 2.0
> Reporter: Ate Douma
> Assignee: Ate Douma
> Fix For: 2.0
>
>
> The SCXML spec [1] section 3.2.2 <scxml> children, defines as an allowable
> child element:
> - <script> Provides scripting capability. Occurs 0 or 1 times.
> Current Commons SCXML doesn't yet support this feature, ignoring such initial
> script element.
> As this will be very useful also for the Groovy language support (SCXML-186),
> I'll add this feature to Commons SCXML now.
> Important to note is the Context to be provided to such initial script
> execution.
> The intend (at least in my interpretation) of using such an initial script is
> that it can access as well as set any context (data) variable globally for
> the rest of the document.
> This means that the Context for the initial script execution much be a parent
> Context for all other element, including sibling 'root' states.
> Using the root Context for this purpose however is IMO not the right way as
> it would (potentially) impact/change the outcome of a reset of the
> SCXMLExecutor, which resets all Contexts except for the root Context (as
> being a provider of *external* context).
> So, the way I'm going to solve this is by introducing a separate
> InitialScriptContext, having the root Context as parent and itself being used
> as parent for all other contexts, and thereby properly resettable through
> SCXMLExecutor reset.
> Also of importance to mention is when and how this initial script will be
> executed.
> The initial script (if defined) will be stored as a (self) Transition action
> of a synthesized Action (no parent, no children) and stored in the SCXML
> model object.
> During the SCXML initialization/reset by the SCXMLExecutor this script
> (parent transition) then will be injected it in the initial step transition
> list and thereby executed as first action.
> As a transition action, the initial script execution won't 'trigger' any
> event, only registered listeners will be notified of its 'transition'
> [1] http://www.w3.org/TR/2013/WD-scxml-20130801/
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